Backpack Base Weight Calculator
Separate your pack’s base weight from consumables and see your total and skin-out load for lightweight backpacking.
How it works
total = base + food + water + fuel · skin-out = total + worn/carried · tier: <10 lb ultralight, <20 lb lightweight
Base weight is the weight of everything in your pack except consumables — food, water and fuel — because those shrink as you use them, while your gear does not. It is the standard yardstick for comparing kits: under 10 lb is ultralight and under 20 lb lightweight. Total pack weight adds the day’s consumables and is what your shoulders actually feel at the trailhead, while skin-out weight also counts what you wear and carry in hand.
Worked example
With a 15 lb base plus 4.5 lb food, 4.4 lb water and 0.5 lb fuel, total pack weight is 24.4 lb. Adding 5 lb of worn items gives 29.4 lb skin-out, and base is 61% of the loaded pack.
Frequently asked questions
What counts as base weight?
Everything you carry except food, water and fuel — your pack, shelter, sleep system, cook kit, spare clothing and the small items in your pack. Anything consumed on trail is excluded.
What is a good base weight?
Under 20 lb is considered lightweight and under 10 lb ultralight. Most comfortable three-season kits land between 12 and 20 lb without sacrificing safety gear.
Why separate base from total?
Because total weight changes hour to hour as you eat and drink. Base weight is the fixed part you can actually optimize by choosing lighter gear.
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This calculator is for educational purposes. Double-check important results before acting on them.